Oleyl propylenediamine-based corrosion inhibitors

ABSTRACT

Disclosed are oleyl propylenediamine-based compounds used in compositions and methods for inhibiting corrosion. The method comprises introducing into a fluid source a composition comprising one or more oleyl propylenediamine-based compounds comprising Formula I: 
     
       
         
         
             
             
         
       
         
         
           
             wherein Y 1 , Y 2 , and Y 3  independently are hydrogen or a substituent of Formula (II): 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein V is —O— or —NH—, W is optionally present and is a linear or branched C 1-10  aliphatic group, X is —H, —NZ 3   + , —COOH, —SO 3 H, —OSO 3 H 2 , —PO 3 H, —OPO 3 H 2 , or a salt thereof, each Z independently is hydrogen or a linear or branched C 1-20  aliphatic group optionally interrupted or substituted with one or more oxygen atoms, and R is hydrogen or methyl, provided that at least one of Y 1 , Y 2 , or Y 3  is a substituent of Formula (II).

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication Serial No.s 62/727,759, filed Sep. 6, 2018 and 62/820,997,filed Mar. 20, 2019, the disclosures of which are incorporated byreference herein in their entirety for all purposes.

FIELD OF THE INVENTION

The present application is directed at inhibition or prevention ofcorrosion.

BACKGROUND

Corrosion of metal surfaces continues to be a problem in industries suchas oil and gas and industrial water systems, in which the fluids caninclude “corrodents” such as salts or other dissolved solids, liquids,gases, or combination thereof that cause, accelerate, or promotecorrosion of metal containments that contact the corrodents. Corrosionproblems are even more troublesome in deep-sea operations wherereplacement of corroded equipment is difficult and costly. As a result,almost all operators in the oil and gas industry employ corrosioninhibitors to reduce corrosion in metal containments.

Filming corrosion inhibitors have been used to limit the corrosion ofmaterials in industrial water systems. Generally, these filmingcorrosion inhibitors have properties that allow them to attach or bindto the metal and/or metal oxide surface to coat or cover and therebylimit the reduction/oxidation (redox) corrosion process between thewater and the surface. An effective filming corrosion inhibitor inaqueous systems typically includes some degree of hydrophobicity.However, hydrophobicity can limit the applicability and utility of somesubstances in industrial water systems such as steam generators (e.g.,boilers), heat exchange loops, and cooling water systems. Hydrophobicitycan also limit the ability to blend or to make shelf and storage stablehomogenous treatment products. The treatment products are generallyaqueous based products and hydrophobic corrosion inhibitors can separateout of the treatment. Such lack of stability can result in periods ofover feed (higher dosage) and periods of under feed (lesser dosage). Theresulting variation in inhibitor feed can lead to increased corrosion inthe industrial water treatment system.

Some aqueous hydrophobic filming corrosion inhibitors are formulatedwith additional solvents or co-solvents to aid in holding the inhibitorin the product thereby ensuring shelf stability. While these solventsmay provide shelf stability, they may negatively affect the operation ofthe water treatment system, add additional risk of failure, and/orresult in non-compliance with regulations. For example,N-oleyl-1,3-diaminopropane is a hydrophobic corrosion inhibitor that hasbeen used in water treatment systems. N-oleyl-1,3-diaminopropane hasbeen formulated with a solvent, e.g., cyclohexylamine, in sufficientconcentration to provide a shelf stable product for feed and use inindustrial water systems. But regulatory constraints placed on productscontaining cyclohexylamine (e.g., spill reporting requirements and orother hazards) discourage and often prevent the use of this combination.In other types of systems, such as high pressure utility or power steamgeneration systems, the eventual hydrothermal decomposition of theorganic solvent, e.g., cyclohexylamine, also precludes the use of thecombination product in those generators. Other materials that are usedin utility or power steam generating systems are ethanolamine andammonium hydroxide (i.e., aqueous ammonia), but neither are effective assolvents of N-oleyl-1,3-diaminopropane.

In view of these challenges, improved corrosion inhibitors aredesirable.

SUMMARY

Described herein are compositions and methods for inhibiting corrosionin a fluid source. In some embodiments, the fluid source compriseswater, gas, liquid hydrocarbon or combination thereof. Also described isshelf stable corrosion inhibitor without the use of solvents orco-solvents that negatively affect properties of a water system. In someembodiments, the corrosion inhibitor comprises a hydrophobic filmingcorrosion inhibitor which is shelf stable.

In one aspect of the invention is a method of inhibiting corrosion ofmetal containments in contact with a fluid source comprising the stepsof:

-   -   introducing into the fluid source a composition comprising one        or more oleyl propylenediamine-based compounds.

In some embodiments, the oleyl propylenediamine-based compound isrepresented by Formula (I):

wherein Y₁, Y₂, and Y₃ independently are hydrogen or a substituent ofFormula (II):

wherein V is −O— or —NH—, W is optionally present and is a linear orbranched C₁₋₁₀ aliphatic group, X is —H, —NZ₃ ⁺, —COOH, —SO₃H, —PO₃H, ora salt thereof, each Z independently is hydrogen or a linear or branchedC₁₋₂₀ aliphatic group optionally interrupted or substituted with one ormore oxygen atoms, and R is hydrogen or methyl, provided that at leastone of Y₁, Y₂, or Y₃ is a substituent of Formula (II).

In another aspect of the invention is a composition for use as acorrosion inhibitor of a metal surface, comprising one or morecompound(s) of Formula (I):

wherein Y₁, Y₂, and Y₃ independently are hydrogen or a substituent ofFormula (II):

wherein V is −O— or —NH—, W is optionally present and is a linear orbranched C₁₋₁₀ aliphatic group, X is —H, —NZ₃ ⁺, —COOH, —SO₃H, —PO₃H, ora salt thereof, each Z independently is hydrogen or a linear or branchedC₁₋₂₀ aliphatic group optionally interrupted or substituted with one ormore oxygen atoms, and R is hydrogen or methyl, provided that at leastone of Y₁, Y₂, or Y₃ is a substituent of Formula (II).

In another aspect of the invention is a composition for use as acorrosion inhibitor, comprising one or more compound(s) of Formula (I):

-   -   wherein Y₁, Y₂, and Y₃ independently are hydrogen or a        substituent of Formula (II):

-   -   wherein V is −O— or —NH—, W is optionally present and is a        linear or branched C₁₋₁₀ aliphatic group;    -   X is —H, —NZ₃ ⁺, —COOH, —SO₃H, —PO₃H, or a salt thereof;

each Z independently is hydrogen or a linear or branched C₁₋₂₀ aliphaticgroup optionally interrupted or substituted with one or more oxygenatoms; and

R is hydrogen or methyl, provided that at least one of Y₁, Y₂, or Y₃ isa substituent of Formula (II).

In some embodiments the oleyl propylenediamine-based compounds ofFormula I also include Formula III.

In another aspect of the invention is the compound of Formula (I) canhelp to solubilize the compound of Formula (III), such that the compoundof Formula (III) can also act as a corrosion inhibitor in thecomposition.

In another aspect of the invention is a composition that includes theoleyl propylenediamine-based compounds of Formula I and a fluid source.In some embodiments the fluid source is water, gas, optionally liquidhydrocarbon and combinations thereof. In some embodiments the water cancontain dissolved solids and gasses.

In yet another aspect of the invention is a treated metal containmentcomprising:

-   -   a metal containment comprising a metal surface; and    -   the fluid source comprising the oleyl propylenediamine-based        compounds, wherein at least a portion of the metal surface is in        contact with the fluid source.

In another aspect of the invention is the use of the oleylpropylenediamine-based compounds of formula I in an aqueous system tosolubilize the oleyl propylenediamine-based compound of formula III:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an exemplary ¹H-NMR spectrum of the adducts ofN-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid.

FIG. 2 shows an exemplary ESI-MS spectrum of the adducts ofN-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid.

FIG. 3 depicts the results of Example 4.

The patent or application file contains at least one drawing executed incolor. Copies of this patent or patent application publication withcolor drawing(s) will be provided by the Office upon request and paymentof the necessary fee.

DETAILED DESCRIPTION

Although the present disclosure provides references to variousembodiments, persons skilled in the art will recognize that changes maybe made in form and detail without departing from the spirit and scopeof the invention. Various embodiments will be described in detail withreference to the figures. Reference to various embodiments does notlimit the scope of the claims attached hereto. Additionally, anyexamples set forth in this specification are not intended to be limitingand merely set forth some of the many possible embodiments for theappended claims.

Unless otherwise defined, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art. In case of conflict, the present document, includingdefinitions, will control. Methods and materials are described below,although methods and materials similar or equivalent to those describedherein can be used in practice or testing of the present invention. Allpublications, patent applications, patents and other referencesmentioned herein are incorporated by reference in their entirety.

As used herein, the term “alkyl” refers to a monovalent group derived bythe removal of a single hydrogen atom from a straight or branched chainor cyclic saturated or unsaturated hydrocarbon containing from one tosixty carbon atoms.

As used herein, the term “corrodents,” are materials that cause,initiate, catalyze, accelerate, induce, or otherwise promote thecorrosion of metals.

As used herein, the term “corrosion inhibitor” (CI) means a compound ormixture that prevents, retards, mitigates, reduces, controls and/ordelays corrosion.

As used herein, the term “fluid source” means any fluid source used inoil or gas well production operations or industrial water operationssuch as steam generating systems that contain one or more corrodents.

As used herein, the term “inhibits,” “inhibiting,” or grammaticalequivalents thereof refer to preventing, retarding, mitigating,reducing, controlling and/or delaying corrosion.

As used herein, the term “injectate” means water plus any solids orliquids dispersed therein that is injected into a subterranean formationfor the purpose of inducing hydrocarbon recovery therefrom. Injectatesoptionally include salts, polymers, surfactants, scale inhibitors,stabilizers, metal chelating agents, corrosion inhibitors, paraffininhibitors, and other additives as determined by the operator in asubterranean hydrocarbon recovery process.

As used herein, the term “produced water” means water that flows backfrom a subterranean reservoir and is collected during a hydrocarbonrecovery process including, but not limited to hydraulic fracturing andtertiary oil recovery. Produced water includes residual hydrocarbonproducts entrained therein and one or more of injectate, connate (nativewater present in the subterranean formation along with the hydrocarbon),brackish water, and sea water. Produced water ranges in temperature fromabout −30° C. to about 200° C., depending on the subterranean reservoirand the terranean environment and infrastructure proximal to thesubterranean reservoir.

As used herein, the terms “comprise(s),” “include(s),” “having,” “has,”“can,” “contain(s),” and variants thereof are intended to be open-endedtransitional phrases, terms, or words that do not preclude thepossibility of additional acts or structures. The singular forms “a,”“and” and “the” include plural references unless the context clearlydictates otherwise. The present disclosure also contemplates otherembodiments “comprising,” “consisting of” and “consisting essentiallyof,” the embodiments or elements presented herein, whether explicitlyset forth or not.

As used herein, the term “optional” or “optionally” means that thesubsequently described event or circumstance may but need not occur, andthat the description includes instances where the event or circumstanceoccurs and instances in which it does not.

As used herein, the term “about” modifying, for example, the quantity ofan ingredient in a composition, concentration, volume, processtemperature, process time, yield, flow rate, pressure, and like values,and ranges thereof, employed in describing the embodiments of thedisclosure, refers to variation in the numerical quantity that canoccur, for example, through typical measuring and handling proceduresused for making compounds, compositions, concentrates or useformulations; through inadvertent error in these procedures; throughdifferences in the manufacture, source, or purity of starting materialsor ingredients used to carry out the methods, and like proximateconsiderations. The term “about” also encompasses amounts that differdue to aging of a formulation with a particular initial concentration ormixture, and amounts that differ due to mixing or processing aformulation with a particular initial concentration or mixture. Wheremodified by the term “about” the claims appended hereto includeequivalents to these quantities. Further, where “about” is employed todescribe a range of values, for example “about 1 to 5” the recitationmeans “1 to 5” and “about 1 to about 5” and “1 to about 5” and “about 1to 5” unless specifically limited by context.

As used herein, the term “substantially” means “consisting essentiallyof” and includes “consisting of” “and “consisting essentially of” and“consisting of” are construed as in U.S. patent law. For example, asolution that is “substantially free” of a specified compound ormaterial may be free of that compound or material, or may have a minoramount of that compound or material present, such as through unintendedcontamination, side reactions, or incomplete purification. A “minoramount” may be a trace, an unmeasurable amount, an amount that does notinterfere with a value or property, or some other amount as provided incontext. A composition that has “substantially only” a provided list ofcomponents may consist of only those components, or have a trace amountof some other component present, or have one or more additionalcomponents that do not materially affect the properties of thecomposition. Additionally, “substantially” modifying, for example, thetype or quantity of an ingredient in a composition, a property, ameasurable quantity, a method, a value, or a range, employed indescribing the embodiments of the disclosure, refers to a variation thatdoes not affect the overall recited composition, property, quantity,method, value, or range thereof in a manner that negates an intendedcomposition, property, quantity, method, value, or range. Where modifiedby the term “substantially” the claims appended hereto includeequivalents according to this definition.

As used herein, any recited ranges of values contemplate all valueswithin the range and are to be construed as support for claims recitingany sub-ranges having endpoints which are real number values within therecited range. By way of example, a disclosure in this specification ofa range of from 1 to 5 shall be considered to support claims to any ofthe following ranges: 1-5; 1-4; 1-3; 1-2; 2-5; 2-4; 2-3; 3-5; 3-4; and4-5.

Described are compositions and methods to inhibit corrosion of metalcontainments used in liquid hydrocarbon recovery systems and industrialwater systems and the associated processing, transportation, and storageoperations of these systems.

In some embodiments, the compounds used in the compositions and methodsfor inhibiting corrosion is an oleyl propylenediamine compound andmodified versions of oleyl propylenediamine compounds or combinationsthereof, collectively referred to in this application as “oleylpropylenediamine-based compounds.”

A composition (e.g., an aqueous solution described herein) for use as acorrosion inhibitor of a metal surface is provided. The compositioncomprises one or more compound(s) of Formula (I):

wherein Y₁, Y₂, and Y₃ independently are hydrogen or a substituent ofFormula (II):

wherein V is −O— or —NH—, W is optionally present and is a linear orbranched C₁₋₁₀ aliphatic group, X is —H, —NZ₃ ⁺, —COOH, —SO₃H, —PO₃H, ora salt thereof, each Z independently is hydrogen or a linear or branchedC₁₋₂₀ aliphatic group optionally interrupted or substituted with one ormore oxygen atoms, and R is hydrogen or methyl, provided that at leastone of Y₁, Y₂, or Y₃ is a substituent of Formula (II).

Accordingly, the one or more compound(s) of Formula (I) can have astructure wherein Y₁ is a substituent of Formula (II) and Y₂ and Y₃ arehydrogen, Y₁ is hydrogen and Y₂ and Y₃ are a substituent of Formula(II), Y₂ is a substituent of Formula (II) and Y₁ and Y₃ are hydrogen, Y₂is hydrogen and Y₁ and Y₃ are a substituent of Formula (II), Y₃ is asubstituent of Formula (II) and Y₁ and Y₂ are hydrogen, Y₃ is hydrogenand Y₁ and Y₂ are a substituent of Formula (II), Y₁, Y₂, and Y₃ are asubstituent of Formula (II), or a combination thereof.

In some embodiments, Y₁, Y₂, and Y₃ independently are hydrogen or asubstituent of Formula (II):

wherein V is −O— or —NH—, W is optionally present and is a linear orbranched C₁₋₁₀ aliphatic group, X is —H, —NZ₃ ⁺, —COOH, —SO₃H, —OSO₃H₂,—PO₃H, —OPO₃H₂, or a salt thereof, each Z independently is hydrogen or alinear or branched C₁₋₂₀ aliphatic group optionally interrupted orsubstituted with one or more oxygen atoms, and R is hydrogen or methyl.In some embodiments, R is hydrogen. In other embodiments, R is methyl.

As used herein, when the term “optionally present” is used to refer to achemical structure (e.g., “W”), and when that chemical structure is notpresent, the bond originally made to the chemical structure is madedirectly to the adjacent atom. As used herein, the terms “independent”and “independently,” when referring to one or more constituent (e.g.,Y₁, Y₂, and/or Y₃), means that each substituent is individually selectedfrom the list and can be the same or different. For example, ifconstituent Y₁ appears more than once in a formula and Y₁ isindependently selected from a recited list, then each Y₁ may be the sameor different and selected from the recited list, and likewise each Y₂and likewise each Y₃.

In some embodiments, W is optionally present and is a linear or branchedC₁₋₁₀ aliphatic group, in which, “C₁₋₁₀ aliphatic” refers to analiphatic carbon chain from 1 to 10 (i.e., 1, 2, 3, 4, 5, 6, 7, 8, 9, or10) carbons in length. The linear or branched C₁₋₁₀ aliphatic group isdivalent, as necessitated by the adjacent “V” and “X” groups. As usedherein, the term “divalent” refers to a chemical substituent having twopoints of attachment for covalently linking two moieties in a moleculeor material. The linear or branched C₁₋₁₀ aliphatic group can besaturated or unsaturated, and cyclic or non-cyclic. An exemplary, butnon-limiting list of C₁₋₁₀ aliphatic groups includes divalent methane,ethane, n-propane, iso-propane, n-butane, sec-butane, tert-butane,n-pentane, sec-pentane, neo-pentane, hexane, heptane, octane, nonane,cyclopentane, cyclohexane, propene, 2-butene, 3-butene, 2-pentene,3-pentene, 4-pentene, and a combination thereof.

In some embodiments, X is —H, —NZ3+, —COOH, —SO3H, —OSO3H2, —PO3H,—OPO3H2, or a salt thereof. As used herein, the phrase “salt thereof”refers to any chemical species having an ion/counter ion pair. Forexample, —NZ3+ can be paired with any suitable anion (e.g., Cl—, Br—,I—, OH—, NO2-, or NO3-) so as to form a salt species. Similarly, anyhydrogen atom can be removed from the embodiments of X (e.g., —H, —COOH,—SO3H, —OSO3H2, —PO3H, and —OPO3H2) so as to form a negatively chargedspecies, which in turn can be paired with any suitable cation (e.g.,Li+, Na+, K+, or NH4+) so as to form a salt species.

In some embodiments, Z is hydrogen or a linear or branched C1-20aliphatic group, in which, “C1-20 aliphatic” refers to an aliphaticcarbon chain from 1 to 20 (i.e., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,13, 14, 15, 16, 17, 18, 19, or 20) carbons in length, optionallyinterrupted or substituted with one or more oxygen atoms. In someembodiments, Z is interrupted with one or more oxygen atoms. As usedherein, the phrase “interrupted with one or more oxygen atoms” refers toan alkyl substituent which contains at least 1 oxygen atom in the coreof the substituent (i.e., the carbon backbone). In some embodiments, thealkyl substituent has at least 2 oxygen atoms in the core of thesubstituent (e.g., at least 3, 4, 5, or 6 oxygen atoms in the core ofthe substituent). In some embodiments, Z is substituted with one or moreoxygen atoms. As used herein, the term “substituted with one or moreoxygen atoms” can mean that one or more hydrogens on the designated atomor group are replaced with an oxygen atom provided that the designatedatom's normal valence is not exceeded. For example, when the substituentis oxo (viz., ═O), then two hydrogens bonded to the atom are replaced.

In some embodiments, the composition comprises one or more compound(s)of Formula (I):

wherein Y₁, Y₂, and Y₃ independently are hydrogen or a substituent offormula:

or salts thereof.

In some embodiments, the composition comprises one or more compound(s)of formula:

or salts thereof, wherein each C₁₈H₃₅ refers to a substituent of formula

The composition can further comprise a compound of Formula (III):

In some embodiments, the oleyl propylenediamine-based compounds are anacrylic acid oleyl propylenediamine-based compounds. In someembodiments, the acrylic acid oleyl propylenediamine-based compoundsare:

In some embodiments, the oleyl propylenediamine-based compounds areacrylamide tertiary butyl sulfonic acid oleyl propylenediamine-basedcompounds. In some embodiments, the acrylamide tertiary butyl sulfonicacid oleyl propylenediamine-based compounds are:

The compositions and methods described herein are used to inhibitcorrosion. In some embodiments, compositions comprise, consistessentially of, or consist of at least one of the described oleylpropylenediamine-based compounds used for corrosion inhibition.

In some embodiments, the oleyl propylenediamine-based compounds orcompositions containing them include other additives such as one or moreasphaltene inhibitors, paraffin inhibitors, scale inhibitors,demulsifiers, water clarifiers, dispersants, emulsion breakers,antifoams, other corrosion inhibitors (e.g. quaternary ammoniumcompounds, imidazolines, sulfur-containing chemistries such asmercaptoethanol and thioglycolic acid, pyridines, quinolones or thelike), oxygen scavengers, or any combination thereof. In someembodiments, the oleyl propylenediamine-based compounds further compriseone or more solvents or a mixture thereof.

In some embodiments, the solvents suitable for formulation with theoleyl propylenediamine-based compounds or composition containing themare water, brine, seawater, alcohols such as methanol, ethanol,isopropanol, n-propanol, n-butanol, isobutanol, sec-butanol, t-butanolor higher alcohols such as benzyl alcohol); ketones such as acetone, ormethyl ethyl ketone (2-butanone); acetonitrile; esters such as ethylacetate, propyl acetate and butyl acetate; ethers such as diethyl etheror higher, e.g. methyl t-butyl ether, glyme, diglyme, ethylene glycolmonobutyl ether, ethylene diglycol ethyl ether, 1,4 dioxane and related;aromatics such as toluene, xylene(s), diethylbenzene, naphthalene andrelated aromatics or refinery cuts (heavy aromatic naptha, heavyaromatic distillates, and related); aliphatics such as pentane, hexane,heptane, octane, or refined gasoline; or several “green” solvents suchas 2-methyltetrahydrofuran, furfural alcohol, andcyclopentylmethylether.

In some embodiments, the solvents suitable for formulation with theoleyl propylenediamine-based compounds or compositions containing themare aliphatic, such as pentane, hexane, cyclohexane, methylcyclohexane,heptane, decane, dodecane, diesel, and the like, and aromatics, such astoluene, xylene, heavy aromatic naphtha, fatty acid derivatives (acids,esters, amides), and the like.

In some embodiments, the composition can include solvents disclosed inU.S. Patent Application Publication No. 2018/0346796.

In some embodiments, various dosage amounts of the oleylpropylenediamine-based compounds or compositions containing them areintroduced into a fluid source in contact with a metal containment toinhibit corrosion. One of ordinary skill in the art is able to calculatethe amount of oleyl propylenediamine-based compounds or compositionscomprising, consisting essentially of, or consisting of the oleylpropylenediamine-based compounds for a given situation without undueexperimentation. Factors that would be considered important in suchcalculations include, for example, content of fluid source, content ofcorrodents, percentage water cut, and similar parameters.

In some embodiments, the oleyl propylenediamine-based compounds alone orin a composition is used in an amount from about 1 ppm to 10,000 ppm;from about 100 ppm to about 1,000; from about 500 ppm to about 3,000ppm; from 750 ppm to 3,000 ppm; from about 2,000 ppm to about 5,000 ppm;from about 3,000 ppm to about 5,000 ppm; 100 ppm to 3,000 ppm; 1 ppm to100 ppm; 1 ppm to 20 ppm; 1 ppm to 5 ppm; 5 ppm to 20 ppm; 10 ppm to 50ppm; 20 ppm to 100 ppm or 50 ppm to 500 ppm.

In some embodiments, the compound of Formula (III)(“N-oleyl-1,3-diaminopropane”) can be present in the composition in anysuitable amount. Without wishing to be bound by any particular theory,it is believed that in addition to the compound of Formula (I) beingsoluble in an aqueous solution and capable of acting as a corrosioninhibitor, the compound of Formula (I) can also help to solubilize thecompound of Formula (III), such that the compound of Formula (III) canalso act as a corrosion inhibitor in the composition. Accordingly, thecompound of Formula (III) can be present in an amount of about 0.0001wt. % or more (e.g., about 0.001 wt. % or more, about 0.01 wt. % ormore, about 0.1 wt. % or more, about 1 wt. % or more, about 5 wt. % ormore, about 10 wt. % or more, or about 20 wt. % or more) relative to thesum total of the one or more compounds of Formula (I) and the compoundof Formula (III) in the composition. In some embodiments, the compoundof Formula (III) can be present in an amount of about 95 wt. % or less(e.g., about 90 wt. % or less, about 80 wt. % or less, about 70 wt. % orless, about 60 wt. % or less, about 50 wt. % or less, about 25 wt. % orless, about 10 wt. % or less, or about 5 wt. % or less) relative to thesum total of the one or more compounds of Formula (I) and the compoundof Formula (III) in the composition. Any two of the foregoing endpointscan be used to define a close-ended range, or any single endpoint can beused alone to define an open-ended range. For example, the compound ofFormula (III) can be present in an amount of about 0.0001 wt. % to about95 wt. %, about 1 wt. % to about 95 wt. %, about 5 wt. % to about 5 wt.%, about 10 wt. % to about 95 wt. %, about 20 wt. % to about 95 wt. %,about 0.0001 wt. % to about 50 wt. %, about 1 wt. % to about 50 wt. %,about 5 wt. % to about 50 wt. %, about 10 wt. % to about 50 wt. %, about20 wt. % to about 50 wt. %, about 0.0001 wt. % to about 25 wt. %, about1 wt. % to about 25 wt. %, about 5 wt. % to about 25 wt. %, about 10 wt.% to about 25 wt. %, or about 20 wt. % to about 25 wt. % relative to thesum total of the one or more compounds of Formula (I) and the compoundof Formula (III) in the composition. Without wishing to be bound by anyparticular theory, it is believed that the compound of Formula (I) mustbe present in an amount of at least about 5 wt. % relative to the sumtotal of the one or more compounds of Formula (I) and the compound ofFormula (III) in the composition in order to produce a homogeneouscomposition.

In some embodiments, the compound of Formula (III) is present as aresult of being residual starting material. Without wishing to be boundby any particular theory, it is believed that some of theN-oleyl-1,3-diaminopropane may go unreacted such that there is residualN-oleyl-1,3-diaminopropane present in the composition. Typically, whenthe composition comprises N-oleyl-1,3-diaminopropane as a result ofbeing residual starting material, the N-oleyl-1,3-diaminopropane ispresent in a trace amount relative to the sum total of the one or morecompounds of Formula (I) and the compound of Formula (III) in thecomposition. Accordingly, N-oleyl-1,3-diaminopropane can be present inan amount of about 0.0001 wt. % or more (e.g., about 0.001 wt. % ormore, about 0.01 wt. % or more, about 0.1 wt. % or more, or about 1 wt.% or more) relative to relative to the sum total of the one or morecompounds of Formula (I) and the compound of Formula (III) in thecomposition. In some embodiments, N-oleyl-1,3-diaminopropane can bepresent in an amount of about 5 wt. % or less (e.g., about 4 wt. % orless, about 3 wt. % or less, about 2 wt. % or less, about 1 wt. % orless, about 0.1 wt. % or less, about 0.01 wt. % or less, or about 0.001wt. % or less) relative to relative to the sum total of the one or morecompounds of Formula (I) and the compound of Formula (III) in thecomposition. Any two of the foregoing endpoints can be used to define aclose-ended range, or any single endpoint can be used alone to define anopen-ended range. In some embodiments, the composition is substantiallyfree of N-oleyl-1,3-diaminopropane. As used herein, the phrase“substantially free” refers to no detectable amount.

In some embodiments, the composition does not contain cyclohexylamine.In some embodiments, the composition is substantially free ofcyclohexylamine. As described herein, the use of cyclohexylamine isconsidered problematic, and thus, regulatory constraints placed onproducts containing cyclohexylamine prohibit the use of this combinationfor many applications.

Typically, the compositions, described herein, are stable to ambientconditions. In some embodiments, the composition is stable at roomtemperature for at least 6 months, when stored in a sealed container.For example, the composition can be stable at room temperature for atleast 9 months, e.g., at least 12 months, at least 18 months, or atleast 24 months, when stored in a sealed container. As used herein, thephrase “sealed container” refers to a container constructed ofcompatible materials (e.g., glass or non-gas permeable plastic) that hasbeen sealed shut. The sealed container can be any non-gas permeablecontainer, where water or volatile materials cannot escape when sealedwith a lid that limits evaporation. The non-gas permeable container alsolimits O2 or CO2 ingress into the composition at storage temperatures.Typical examples would be glass jars or bottles with tight-sealing lids,or non-gas permeable plastic bottles with tight-sealing lids.

In some embodiments, the composition further comprises water. Thecomposition can comprise any amount of water. For example, thecomposition can comprise from about 1 part-per-trillion (“ppt”) (i.e.,0.0000000001 wt. %) to about 10 parts-per-thousand (i.e., 1 wt. %) ofwater. In some embodiments, the composition comprises about 10 ppt ormore of water, for example, about 100 ppt or more, about 1part-per-billion (“ppb”) (i.e., 0.0000001 wt. %) or more, about 2 ppb ormore, about 5 ppb or more, about 10 ppb or more, about 50 ppb or more,about 100 ppb or more, about 500 ppb or more, or about 1part-per-million (“ppm”) or more. In some embodiments, the compositioncan comprise about 10 parts-per-thousand or less of water, for example,about 5 parts-per-thousand or less, about 1 parts-per-thousand or less,about 500 ppm or less, about 100 ppm or less, about 50 ppm or less,about 10 ppm or less, about 1 ppm or less, about 500 ppb or less, orabout 100 ppb or less. Thus, the composition can comprise any suitableamount bounded by any two of the aforementioned endpoints to achieve thedesired concentration of water. The composition can comprise water in anamount from about 10 ppt to about 10 parts-per-thousand, for example,from about 10 ppt to about 10 ppm, from about 100 ppt to about 10parts-per-thousand, from about 100 ppt to about 100 ppm, from about 2ppb to about 10 parts-per-thousand, from about 2 ppb to about 5parts-per-thousand, from about 2 ppb to about 1 parts-per-thousand, fromabout 2 ppb to about 500 ppm, from about 2 ppb to about 100 ppm, fromabout 2 ppb to about 50 ppm, from about 2 ppb to about 10 ppm, fromabout 2 ppb to about 5 ppm, from about 2 ppb to about 1 ppm, from about2 ppb to about 500 ppb, from about 2 ppb to about 100 ppb, from about 5ppb to about 10 ppm, from about 10 ppb to about 10 ppm, from about 50ppb to about 10 ppm, from about 100 ppb to about 10 ppm, from about 500ppb to about 10 ppm, from about 1 ppm to about 10 ppm, from about 5 ppmto about 10 ppm, from about 500 ppb to about 50 parts-per-thousand, fromabout 500 ppb to about 10 parts-per-thousand, from about 500 ppb toabout 1 parts-per-thousand, from about 500 ppb to about 100 ppm, fromabout 500 ppb to about 10 ppm, from about 500 ppb to about 5 ppm, orfrom about 500 ppb to about 1 ppm.

In some embodiments, the composition is diluted (e.g., with water) toform an aqueous solution for use as a corrosion inhibitor of a metalsurface.

In some embodiments, the composition is an aqueous solution describedherein.

In some embodiments, the aqueous solution is a composition describedherein.

The aqueous solution can comprise any amount of the one or morecompound(s) of Formula (I). For example, the aqueous solution cancomprises from about 1 part-per-trillion (“ppt”) (i.e., 0.0000000001 wt.%) to about 10 parts-per-thousand (i.e., 1 wt. %) of the one or morecompound(s) of Formula (I). In some embodiments, the aqueous solutioncomprises about 10 ppt or more of the one or more compound(s) of Formula(I), for example, about 10 ppt or more, about 1 part-per-billion (“ppb”)(i.e., 0.0000001 wt. %) or more, about 2 ppb or more, about 5 ppb ormore, about 10 ppb or more, about 50 ppb or more, about 100 ppb or more,about 500 ppb or more, or about 1 part-per-million (“ppm”) or more. Insome embodiments to, the aqueous solution can comprise about 10parts-per-thousand or less of the one or more compound(s) of Formula(I), for example, about 5 parts-per-thousand or less, about 1parts-per-thousand or less, about 500 ppm or less, about 100 ppm orless, about 50 ppm or less, about 10 ppm or less, about 1 ppm or less,about 500 ppb or less, or about 100 ppb or less. Thus, the aqueoussolution can comprise any suitable amount bounded by any two of theaforementioned endpoints to achieve the desired concentration of the oneor more compound(s) of Formula (I). The aqueous solution can comprisethe one or more compound(s) of Formula (I) in an amount from about 10ppt to about 10 parts-per-thousand, for example, from about 10 ppt toabout 10 ppm, from about 100 ppt to about 10 parts-per-thousand, fromabout 100 ppt to about 100 ppm, from about 2 ppb to about 10parts-per-thousand, from about 2 ppb to about 5 parts-per-thousand, fromabout 2 ppb to about 1 parts-per-thousand, from about 2 ppb to about 500ppm, from about 2 ppb to about 100 ppm, from about 2 ppb to about 50ppm, from about 2 ppb to about 10 ppm, from about 2 ppb to about 5 ppm,from about 2 ppb to about 1 ppm, from about 2 ppb to about 500 ppb, fromabout 2 ppb to about 100 ppb, from about 5 ppb to about 10 ppm, fromabout 10 ppb to about 10 ppm, from about 50 ppb to about 10 ppm, fromabout 100 ppb to about 10 ppm, from about 500 ppb to about 10 ppm, fromabout 1 ppm to about 10 ppm, from about 5 ppm to about 10 ppm, fromabout 500 ppb to about 50 parts-per-thousand, from about 500 ppb toabout 10 parts-per-thousand, from about 500 ppb to about 1parts-per-thousand, from about 500 ppb to about 100 ppm, from about 500ppb to about 10 ppm, from about 500 ppb to about 5 ppm, or from about500 ppb to about 1 ppm.

The aqueous solution can have any suitable pH. For example, the aqueoussolution can have a pH of about 7 or more, e.g., about 7.5 or more,about 8 or more, about 8.5, or about 9 or more. In some embodiments, theaqueous solution can have a pH of about 14 or less, e.g., about 13 orless, about 12 or less, about 11 or less, about 10 or less, about 9 orless, or about 8 or less. Thus, the aqueous solution can have a pHbounded by any two of the above endpoints recited for the aqueoussolution. For example, the aqueous solution can have a pH of about 7 toabout 14, e.g., about 7 to about 13, about 7 to about 12, about 7 toabout 11, about 7 to about 10, about 7 to about 9, about 7 to about 8,about 7.5 to about 11, about 7.5 to about 10, about 7.5 to about 9,about 7.5 to about 8, about 8 to about 11, about 8 to about 10, about 8to about 9, about 8.5 to about 11, about 8.5 to about 10, about 9 toabout 11, or about 9 to about 10.

The pH of the aqueous solution can be adjusted using any suitable acidor base. Non-limiting examples of suitable acids include nitric acid,sulfuric acid, phosphoric acid, and organic acids such as acetic acid oradipic acid. Non-limiting examples of suitable bases include sodiumhydroxide, potassium hydroxide, and ammonium hydroxide, and organicbases such as ethanolamine, diethanolamine, and triethanolamine.

In some embodiments, the composition comprising the oleylpropylenediamine-based compounds or composition comprising them are usedin a method of inhibiting corrosion of a metal surface in contact with afluid source. In some embodiments, the method comprises treating a metalsurface (e.g., surfaces of metal pipes, tubes, tanks, etc.) with anaqueous solution comprising one or more compound(s) of Formula (I).

The metal surface can comprise any suitable metal or metal alloy. Forexample, the metal surface can comprise steel (including stainlesssteel, galvanized steel, hot dipped galvanized steel, electrogalvanizedsteel, annealed hot dipped galvanized steel, etc.), nickel, titanium,tantalum, aluminum, copper, gold, silver, platinum, zinc, nickeltitanium alloy (nitinol), an alloy of nickel, chromium, iron, iridium,tungsten, silicon, magnesium, tin, alloys of any of the foregoingmetals, coatings containing any of the foregoing metals, andcombinations thereof.

The metal surface can be treated by any suitable method. For example,the metal surface can be treated with the oleyl propylenediamine-basedcompound or an aqueous solution of the compounds by injecting theaqueous solution on the metal surface, pumping the aqueous solution onthe metal surface, pouring the aqueous solution on the metal surface,spraying the aqueous solution on the metal surface, wiping the metalsurface with the aqueous solution, coating the metal surface with theaqueous solution, dipping the metal surface in the aqueous solution,soaking the metal surface in the aqueous, or any combination thereof. Insome embodiments, the metal surface can be treated with the aqueoussolution by delivering the aqueous solution to a hot water- orsteam-generating apparatus. In such embodiments, the one or morecompounds of Formula (I) can diffuse through the hot water- orsteam-generating apparatus by way of the aqueous solution, therebycoating the metal surfaces of the hot water- or steam-generatingapparatus.

The metal surface can be part of an apparatus (e.g., a machine). Theapparatus can have any suitable operating conditions (e.g., humidity,pressure, or temperature). In some embodiments, the metal surface is apart of an apparatus that operates at a temperature of from about −30°C. to about 1,000° C. The metal surface can be part of an apparatus thatoperates at a temperature of about 1,000° C. or less, for example, about750° C. or less, about 500° C. or less, about 450° C. or less, about400° C. or less, about 350° C. or less, about 300° C. or less, about250° C. or less, about 200° C. or less, about 150° C. or less, or about100° C. In some embodiments, the metal surface can be part of anapparatus that operates at a temperature of about 35° C. or more, forexample, about 50° C. or more, about 100° C. or more, about 150° C. ormore, about 200° C. or more, about 250° C. or more, or about 300° C. ormore. Any two of the foregoing endpoints can be used to define aclose-ended range, or one endpoint can be used alone to define anopen-ended range. Thus, metal surface can be part of an apparatus thatoperates at a temperature from about 35° C. to about 750° C., forexample, from about 35° C. to about 500° C., from about 35° C. to about400° C., from about 35° C. to about 350° C., from about 35° C. to about300° C., from about 35° C. to about 250° C., from about 35° C. to about200° C., from about 35° C. to about 150° C., from about 35° C. to about100° C., from about 50° C. to about 500° C., from about 100° C. to about1,000° C., from about 100° C. to about 750° C., from about 100° C. toabout 500° C., from about 100° C. to about 400° C., from about 100° C.to about 300° C., from about 100° C. to about 200° C., from about 100°C. to about 400° C., from about 150° C. to about 400° C., from about200° C. to about 400° C., or from about 300° C. to about 400° C.

In some embodiments, the metal surface is a part of an apparatus thatoperates at a pressure of from about 7 kPa (1 psig) to about 27579 kPa(4,000 psig). The metal surface can be part of an apparatus thatoperates at a pressure of about 27579 kPa (4,000 psig) or less, forexample, about 20684 kPa (3,000 psig) or less, about 18960 kPa (2,750psig) or less, about 17237 kPa (2,500 psig) or less, about 13790 kPa(2,000 psig) or less, about 10342 kpa (1,500 psig) or less, about 6895kPa (1,000 psig) or less, about 3447 kPa (500 psig) or less, about 3102kPa (450 psig) or less, about 2758 kPa (400 psig) or less, about 2413kPa (350 psig) or less, about 2068 kPa (300 psig) or less, about 1724kPa (250 psig) or less, about 1379 kPa (200 psig) or less, about 1034kPa (150 psig) or less, about 689 kPa (100 psig) or less, or about 345kPa (50 psig) or less. In some embodiments, the metal surface can bepart of an apparatus that operates at a pressure of about 7 kPa (1 psig)or more, for example, about 14 kPa (2 psig or more, about 21 kPa (3psig) or more, about 28 kPa (4 psig) or more, about 34 kPa (5 psig) ormore, about 69 kPa (10 psig) or more, about 172 kPa (25 psig) or more,about 345 kPa (50 psig) or more, or about 689 kPa (100 psig) or more.Any two of the foregoing endpoints can be used to define a close-endedrange, or one endpoint can be used alone to define an open-ended range.Thus, metal surface can be part of an apparatus that operates at apressure from about 7 kPa (1 psig) to about 20684 kPa (3,000 psig), forexample, from about 7 kPa (1 psig) to about 17237 kPa (2,500 psig), fromabout 7 kPa (1 psig) to about 13789 kP (2,000 psig), from about 7 kPa (1psig) to about 6895 kPa (1,000 psig), from about 689 kPa (100 psig) toabout 27579 kPa (4,000 psig), from about 689 kPa (100 psig) to about20684 kPa (3,000 psig), from about 689 kPa (100 psig) to about 17237 kPa(2,500 psig), from about 17237 kPa (100 psi)g to about 13790 kPa (2,000psig), from about 689 kPa (100 psig) to about 6895 kPa (1,000 psig),from about 7 kPa (1 psig) to about 3447 kPa (500 psig), from about 7 kPa(1 psig) to about 2758 kPa (400 psig), from about 7 kPa (1 psig) toabout 2413 kPa (350 psig), from about 7 kPa (1 psig) to about 2068 kPa(300 psig), from about 7 kPa (1 psig) to about 1724 kPa (250 psig), fromabout 7 kPa (1 psig) to about 1379 kPa (200 psig), from about 7 kPa (1psig) to about 1034 kPa (150 psig), from about 7 kPa (1 psig) to about689 kPa (100 psig), from about 7 kPa (1 psig) to about 50 psig, fromabout 14 kPa (2 psig) to about 3447 kPa (500 psig), from about 14 kPa (2psig) to about 2758 kPa (400 psig, from about 14 kPa (2 psig) to about2068 kPa (300 psig), from about 14 kPa (2 psig) to about 1379 kPa (200psig), from about 14 kPa (2 psig) to about 689 kPa (100 psig), fromabout 21 kPa (3 psig) to about 3447 kPa (500 psig), from about 21 kPa (3psig) to about 2758 kPa (400 psig), from about 21 kPa (3 psig) to about2068 kPa (300 psig), from about 21 kPa (3 psig) to about 1379 kPa (200psig), from about 21 kPa (3 psig) to about 689 kPa (100 psig), fromabout 34 kPa (5 psig) to about 3447 kPa (500 psig), from about 34 kPa (5psig) to about 2758 kPa (400 psig), from about 34 kPa (5 psig) to about2068 kPa (300 psig), from about 34 kPa (5 psig) to about 1379 kPa (200psig), from about 34 kPa (5 psig) to about 689 kPa (100 psig), fromabout 69 kPa (10 psig) to about 3447 kPa (500 psig), from about 69 kPa(10 psig) to about 2758 kPa (400 psig), from about 69 kPa (10 psig) toabout 2068 kPa (300 psig), from about 69 kPa (10 psig) to about 1379 kPa(200 psig), or from about 69 kPa (10 psig) to about 689 kPa (100 psig).

In some embodiments, the metal surface is in a hot water or steamgenerating system (i.e., apparatus). In some embodiments, the steamgenerating system is a boiler, heat exchange loops and cooling watersystems. In some embodiments where the metal surface is in a hot wateror steam generating system, the hot water or steam-generating systemoperates at a temperature of about 100° C. or more. For example, the hotwater or steam-generating system can operate at a temperature from about100° C. to about 1,000° C. (e.g., about 100° C. to about 750° C., about100° C. to about 500° C., about 100° C. to about 400° C., about 100° C.to about 300° C., about 100° C. to about 200° C., about 100° C. to about350° C., about 150° C. to about 350° C., about 200° C. to about 350° C.,or about 350° C. to about 500° C.).

In some embodiments, the metal surface is in an oil and gas generatingsystem (i.e., apparatus). In some embodiments the metal surface in theoil and gas generating system operates at a temperature of about −30° C.to 200° C.

In some embodiments, the aqueous solution is used in treating a surfaceexposed to hot water or steam at a temperature of at least 35° C. and ata pressure of at least 3447 kPa (500 psig). For example, the aqueoussolution can be used in treating a surface exposed to hot water or steamat a temperature of at least 35° C. and at a pressure of at least 6895kPa (1,000 psig), e.g., at least 35° C. and at a pressure of at least13790 kPa (2,000 psig), at least 100° C. and at a pressure of at least3447 kPa (500 psig), at least 100° C. and at a pressure of at least 6895kPa (1,000 psig), at least 100° C. and at a pressure of at least 13790kPa (2,000 psig), at least 300° C. and at a pressure of at least 3447kPa (500 psig), at least 300° C. and at a pressure of at least 6895 kPa(1,000 psig), or at least 300° C. and at a pressure of at least 13790kPa (2,000 psig). In some embodiments, the aqueous solution is used intreating a surface exposed to hot water or steam at a temperature offrom about 300° C. to about 400° C., and a pressure of from about 13790kPa (2,000 psig) to about 22063 kPa (3,200 psig).

In some embodiments, the hot water- or steam-generating system is aboiler. As used herein, the term “boiler” refers to an apparatus thatcreates steam from liquid water. A boiler may be connected to a closedor open loop fluid circuit for circulating water and/or steam from theheater to a utilization site, e.g., a heat exchanger, a radiator, apower source such as, for example, a turbine or an engine, an ejector orinjector, in the utilization site, the water/steam gives up energy anddecreases in temperature; if the temperature decrease is large enough,steam may condense. Typical closed loop systems include heatingcircuits, heat exchanger loops, condensing turbine circuits andcondensing reciprocating engine circuits.

The fluid source can be contained in metal containers or in contact withpipelines used to transport fluid sources toward, into, out of a systemsuch as a subterranean formation. In some embodiments, the fluid sourcecomprises corrodents that include hydrogen sulfide, carbon dioxide,oxygen, sodium chloride, calcium chloride, sulfur dioxide, orcombination thereof. In some embodiments, the fluid source compriseswater, gas, and optionally liquid hydrocarbon or combination thereof. Insome embodiments, the fluid source is produced water or an injectate.

In some embodiments, the composition comprising the oleylpropylenediamine-based compounds or compositions containing them areintroduced to a fluid source that contains various levels of water cut.One of ordinary skill in the art understands that “water cut” refers tothe % of water in an oil and water mixture. In some embodiments, thewater cut is from about 1% to about 80% w/w with respect to thehydrocarbon phase. In other embodiments, the water cut is from about 1%to about 30% w/w, from about 5% to about 40% w/w, from about 10% toabout 60% w/w, from about 15% to about 80% w/w with respect to thehydrocarbon phase.

In some embodiments, the oleyl propylenediamine-based compounds orcompositions comprising them are introduced into a fluid source thatcontains various levels of salinity. In some embodiments, the fluidsource has a salinity of about 0.1% to about 25% or about 10% to about25% weight/weight (w/w) total dissolved solids.

In some embodiments, the oleyl propylenediamine-based compounds orcompositions comprising them may be introduced into a fluid source byany means suitable for ensuring dispersal of the oleylpropylenediamine-based compounds through the fluid source being treated.The composition comprising the oleyl propylenediamine-based compoundscan be injected as prepared or formulated in one or more additionalsolvents, depending upon the application and requirements. One of skillin the art will understand that the methods disclosed herein are notlimited in any way by the timing or location of the introduction.

In some embodiments, the oleyl propylenediamine-based compounds areintroduced into a fluid source using various well-known methods and theymay be introduced at numerous, different locations throughout a givensystem. In one embodiment, the composition comprising the oleylpropylenediamine-based compounds compound is pumped into an oil/gaspipeline using an umbilical line. In some embodiments, capillary stringinjection systems may be utilized to deliver the composition. U.S. Pat.No. 7,311,144 provides a description of an apparatus and methodsrelating to capillary injection, the disclosure of which is incorporatedinto the present application in its entirety. In other embodiments, thecomposition comprising the one or more oleyl propylenediamine-basedcompounds are injected using mechanical equipment such as chemicalinjection pumps, piping tees, injection fittings, and the like. In someembodiments, the oleyl propylenediamine-based compounds or compositionscomprising them are introduced into pipelines or tubulars, or viadown-hole tubulars, gas-lift or subsea umbilical systems.

Introducing may be achieved also by mixing, blending with mechanicalmixing equipment or devices, stationary mixing setup or equipment,magnetic mixing or other suitable methods, other equipment and meansknown to one skilled in the art and combinations thereof to provideadequate contact and/or dispersion of the composition into the fluidsource. The contacting can be made in-line and/or offline. The variouscomponents of the composition may be mixed prior to and/or duringcontact. If needed or desired, the composition or some of its componentsmay be optionally removed or separated mechanically, chemically, or byother methods known to one skilled in the art. In some embodiments, theintroducing is similar to the method of treating such as by pouring,spraying, wiping, coating or soaking the oleyl propylenediamine-basedcompounds into a fluid source in contact with a metal surface.

EXAMPLES

The following examples are intended to illustrate different aspects andembodiments of the invention and are not to be considered limiting thescope of the invention. It will be recognized that various modificationsand changes may be made without following the experimental embodimentsdescribed herein, further without departing from the scope of theclaims.

Example 1

A flask equipped with condenser, stirrer, and thermometer was set up and72.22 grams (50%, 0.15753 equivalents) of an aqueous solution of sodiumsalt of 2-acrylamido-2-2 methylpropanesulfonic acid, 50 grams ofisopropyl alcohol, and 50 grams (0.15753 equivalents) of oleylpropylenediamine (a mixture of about 90% oleyl propylenediamine and 10%oleyl mono oleyl amine) were charged to the flask. The mixture wasstirred and heated to 80-82° C. without the use of nitrogen blanket. Thereaction was maintained at 80-82° C. for 6 hours. At end of thereaction, water and isopropyl alcohol was removed using a rotaryevaporator at a temperature below 100° C. A yellowish paste sample wasobtained. Chemical structures of the sample were characterized using1H-NMR and ESI-MS.

Example 2

The bubble cell test was used to investigate the effectiveness of theoleyl propylenediamine-based compounds as corrosion inhibitors. Thistest measures the corrosion rate of a steel electrode by aqueous linearpolarization resistance (LPR). The steel electrodes (C1018) were placedin a bath of synthetic oilfield brine which was deaerated with carbondioxide. The corrosion rate of the electrode was compared in the absenceor presence of oleyl propylenediamine-based compounds.

The synthetic oilfield brine contained about 80% of a 3 wt % sodiumchloride and 20% of a synthetic oil (75% of LVT-200 and 25% xylene). Theoil/brine was placed into bubble cells and continuously purged with CO₂at atmospheric pressure to saturate the oil/brine prior to starting thetest. The test cells were blanketed with CO₂ throughout the duration ofthe test to maintain saturation. The bubble cells were stirred at 100revolutions per minute (rpm) for the duration of the test to maintainthermal equilibrium at 80° C. The electrodes were all cleaned andpolished prior to testing. Details of the test are shown in Table 1.

TABLE 1 Test Conditions Temperature (° C.) 80 Water Cut (%) 80 Oil Type75% LVT-200, Xylene 25% Stirrer Speed (rpm) 100  Purge Gas CO2 CO₂pressure Ambient Electrode Material C1018

After about 3 hours of pre-corrosion time (i.e. without a corrosioninhibitor) 10 ppm of a 20% active of an oleyl propylene diaminechemistry (shown in Table 2) with 2% 2-mercaptoethanol (2ME) solvent wasadded. Comparison with a benzyl ammonium chloride quaternary chemistry(Comparative Sample A) and an imidazoline chemistry (Comparative SampleB) was made at the same active concentration as the oleyl propylenediamine together with 2ME (at the same dose based on chemistry and 2MEactivity—i.e. these were dosed at twice the concentration because theactive and 2ME in the test blend was half).

The bubble cells were dosed with the various samples shown in Table 2.

TABLE 2 Sample Chemistry Blank brine and synthetic oil without acorrosion inhibitor Comparative dimethyl benzyl ammonium chloridequaternary sample A (% n-Alkyl (5% C12, 60% C14, 30% C16, 5% C18)Comparative TOFA:DETA imidazoline salted with acetic acid sample BSample 1 oleyl propylenediamine/mono oleylamine Sample 2 acrylic acid(AA) oleyl propylenediamine-based compounds Sample 3 acrylamide tertiarybutyl sulfonic acid (ATBS) oleyl propylenediamine-based compounds

The results are shown in Table 3.

TABLE 3 Candidate Baseline 15 h after dosing Chemistry CorrosionInhibited Candidate Activity Dosage Rate Corrosion % Chemical ChemistrySynergist (%) (ppm) (mpy) Rate (mpy) Protection Blank N/A N/A N/A 0 260500 −92 Comparative Dimethyl benzyl 1% 2ME 10 20 236 147 38 sample Aammonium chloride quaternary (% n- Alkyl (5% C12, 60% C14, 30% C16, 5%C18) Comparative TOFA:DETA 1% 2ME 10 20 245 141 43 sample B imidazolinesalted with acetic acid Sample 1 oleyl 2% 2ME 20 10 198 23propylenediamine/ mono oleylamine Sample 2 acrylic acid (AA) 2% 2ME 2010 258 103 63 oleyl propylenediamine- based compounds Sample 3acrylamide tertiary 2% 2ME 20 10 279 52 79 butyl sulfonic acid (ATBS)oleyl propylenediamine- based compounds

In the presence of the same concentration of both active chemistry andsynergist (2ME), the acrylic acid (AA) oleyl propylenediamine-basedcompounds (Sample 2) and acrylamide tertiary butyl sulfonic acid (ATBS)oleyl propylenediamine-based compounds (Sample 3) significantlyoutperformed the standard benzyl ammonium chloride quaternary chemistry(Comparative Sample A) and imidazoline chemistry (Comparative Sample B)in which about 63% and 79% corrosion inhibition were gained with Sample2 and Sample 3, respectively compared with only about 38% and 43%corrosion inhibition with Comparative Sample A and Comparative Sample B,respectively. The oleyl propylenediamine-based compounds (Sample 1)showed some inhibition properties but at only 23% inhibition, and wasinferior to both the modified versions (Sample 2 and 3) as well as thestandard benzyl ammonium chloride quaternary and imidazolinechemistries.

Example 3

This example shows an exemplary protocol for the preparation of acomposition comprising an aminoalkylamidoalkane sulfonic salt describedherein.

The adduct of N-oleyl-1,3-diaminopropane and2-acrylamido-2-methylpropane sulfonic acid (i.e., a compound of Formula(I)) as a 4 wt. % solution in water (“Mixture 1”) was formulated withN-oleyl-1,3-diaminopropane as a 4 wt. % solution in water (“Mixture 2”)in ratios set forth in Table 4, and the pH was adjusted to about 8.5with acid.

TABLE 4 Mixture 1 Mixture 2 (g) 4 wt. % (g) 4 wt. % Wt. % FormulaActives Actives Actives Appearance A 60 40 4 Clear solution B 50 50 4semitransparent liquid C 40 60 4 semitransparent liquid D 20 80 4semitransparent liquid E 15 85 4 semitransparent liquid F 10 90 4slightly opaque G 5 95 4 opaque

Mixture 1 was analyzed by ¹H-NMR and ESI-MS and the results are setforth in FIGS. 1 and 2, respectively. As is apparent from FIGS. 1 and 2,the sodium 2-acrylamido-2-methylpropane sulfonate reacted completelywith the N-oleyl-1,3-diaminopropane to form the mono-, di-, andtri-adduct of N-oleyl-1,3-diaminopropane and2-acrylamido-2-methylpropane sulfonic acid.

As shown in Table 4, Formulations A-E resulted in clear orsemitransparent formulations, demonstrating that at concentrations ofgreater than 20 wt. %, the adduct of N-oleyl-1,3-diaminopropane and2-acrylamido-2-methylpropane sulfonic acid is very efficient atsolubilizing N-oleyl-1,3-diaminopropane in an aqueous solution.Formulations F and G, comprising 10 wt. % and 5 wt. % of the adduct ofN-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid, respectively, formed an opaque solution homogeneous solution,demonstrating that at concentrations of 5 wt. % and 10 wt. %, the adductof N-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid is capable of solubilizing N-oleyl-1,3-diaminopropane in an aqueoussolution. These results show that at least about 5 wt. % of the adductof N-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid is necessary to solubilize N-oleyl-1,3-diaminopropane.

Formulations B and D were subjected to stability analysis and determinedto be stable at room temperature for over 1 year. In addition,Formulations B and D were subjected to freeze-thaw cycles from −32° C.to 23° C., and showed no signs of decomposition.

In addition, upon dilution to 0.5% actives, the formulations becomeclear solutions. These results show that the adduct ofN-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid (i.e., a compound of Formula (I)) described herein helps withsolubility of N-oleyl-1,3-diaminopropane and provides a composition thatis stable as an aqueous solution.

Example 4

This example demonstrates the effect on corrosion inhibition exhibitedby a solution comprising water and an aminoalkylamidoalkane sulfonicsalt described herein.

Corrosion tests were conducted in tap water using a flat coupon of lowcarbon steel (0.08 meter×0.01 meter×0.002 meter) (3″×0.5″×0.0625″),Metal Samples Company) and concentrations of 0 ppm (control), 50 ppm,and 200 ppm of the adduct of N-oleyl-1,3-diaminopropane and2-acrylamido-2-methylpropane sulfonic acid described in Example 3. Theflat coupons were submerged in the three solutions of the adduct ofN-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid at room temperature (i.e., about 23° C.) for 7 days. The resultsare set forth in FIG. 3.

As is apparent from the results set forth in FIG. 3, flat couponsexposed to solutions containing 50 ppm and 200 ppm of the adduct ofN-oleyl-1,3-diaminopropane and 2-acrylamido-2-methylpropane sulfonicacid did not rust and maintained a shiny surface after 7 days. The flatcoupon exposed to 0 ppm (control) of the modifiedN-oleyl-1,3-diaminopropane began forming rust after just 2 hours in tapwater. These results show that the adduct of N-oleyl-1,3-diaminopropaneand 2-acrylamido-2-methylpropane sulfonic acid described herein producesadequate corrosion inhibition as a solution in water.

Embodiments of this invention are described herein. Variations of thoseembodiments may become apparent to those of ordinary skill in the artupon reading the foregoing description. Accordingly, embodiments of theinvention includes all modifications and equivalents of the subjectmatter recited in the claims appended hereto as permitted by applicablelaw. Moreover, any combination of the above-described elements in allpossible variations thereof is encompassed by the embodiments of theinvention unless otherwise indicated herein or otherwise clearlycontradicted by context.

What is claimed is:
 1. An aqueous composition for use as a corrosioninhibitor, comprising an oleyl propylendiamine compound of Formula III:

and one or more oleyl propylenediamine-based compound(s) of Formula (I):

wherein Y₁, Y₂, and Y₃ independently are hydrogen or a substituent ofFormula (II)

wherein V is —O— or —NH—, W is optionally present and is a linear orbranched C₁₋₁₀ aliphatic group; X is —H, —NZ₃ ⁺, —COOH, —SO₃H, —PO₃H, ora salt thereof; each Z independently is hydrogen or a linear or branchedC₁₋₂₀ aliphatic group optionally interrupted or substituted with one ormore oxygen atoms; and R is hydrogen or methyl, provided that at leastone of Y₁, Y₂, or Y₃ is a substituent of Formula (II).
 2. Thecomposition of claim 1, wherein the oleyl propylenediamine-basedcompound is selected from the following:


3. The composition of claim 1, wherein the aqueous solution has a pH offrom about 7 to about
 11. 4. The composition of claim 1, wherein theaqueous solution has from about 2 parts-per-billion (“ppb”) to about 50parts-per-thousand of the one or more compound(s) of Formula (I).
 5. Thecomposition of claim 1, wherein the composition is free ofcyclohexylamine.
 6. The composition of claim 1, wherein the compositionis stable at room temperature for at least 6 months.
 7. The compositionof claim 1, further comprising a fluid source, the fluid sourcecomprising water, or gas, optionally liquid hydrocarbon.